UsbDeviceGetDescriptor

Description

Executes the Standard Device Request that obtains the Device Descriptor.

Parameters

Handle

the Device Handle received from the previous UsbOpen.

usLength

the desired number of bytes up to 18 for the whole Device Descriptor.

pucDescriptor

the address of the variable to receive the Device Descriptor.

Return Code

0x0000 - NO_ERROR

Errors

0x0006 - ERROR_INVALID_HANDLE
0x0008 - ERROR_NOT_ENOUGH_MEMORY
0x0057 - ERROR_INVALID_PARAMETER
0x005F - ERROR_INTERRUPT
0x0122 - ERROR_TOO_MANY_HANDLES
0x0280 - ERROR_TIMEOUT
0x1B58 - USB_NOT_INIT
0x4000 - USB_IORB_REQUEST
0x80XX - USB_IORB_FAILED

Example Code

//Code Snippet - UsbDeviceGetDescriptor
{
  APIRET ulrc;
  PUCHAR pucDescriptor;
  UCHAR ucDescriptor[18];
  USHORT usLength = sizeof(ucDescriptor);

  pucDescriptor = &ucDescriptor[0];
  ulrc = UsbDeviceGetDescriptor(Handle,usLength,pucDescriptor);
  printf("\nUsbDeviceGetDescriptor - ulrc: 0x%04X (%hu)",ulrc,ulrc);
  if (!ulrc) //success
  {
    int i; printf(" - DeviceDescriptor:\n");
    for (i=0;i<ucDescriptor[0];i++) printf("%02X",ucDescriptor[i]);
  }
}